气候变化领域集成服务门户(CCPortal): Seasonal variation of the westerly jet over asia in the last glacial maximum: Role of the tibetan plateau heating

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DOI	10.1175/JCLI-D-20-0438.1
	Seasonal variation of the westerly jet over asia in the last glacial maximum: Role of the tibetan plateau heating
	Lei J.; Shi Z.; Xie X.; Sha Y.; Li X.; Liu X.; An Z.
发表日期	2021
ISSN	08948755
起始页码	2723
结束页码	2740
卷号	34 期号:7
英文摘要	The westerly jet (WJ) is an important component of atmospheric circulation, which is characterized by prominent seasonal variations in intensity and position. However, the response of the WJ over Asia during the Last Glacial Maximum (LGM) is still not clear. Using general circulation model experiments, the seasonal behaviors of the WJ over central Asia and Japan are analyzed in this paper. The results show that, compared to the present day (PD), the WJ presents a complicated response during the LGM, both in intensity and position. Over central Asia, it becomes weaker in both summer and winter. But over Japan, it is enhanced in summer but becomes diminished in winter. In terms of position, the WJ over central Asia shifts southward in both summer and winter, whereas the WJ over Japan moves southward in summer but does not change obviously relative to PD in winter. Such WJ changes are well explained by meridional temperature gradients in high troposphere, which is closely linked to seasonal thermal anomalies over the Tibetan Plateau (TP). Despite coolerLGMconditions, the anomalous warming center over the TP becomes stronger in summer. Derived from the heat budget equation, the stronger heating center is mainly caused by the weaker adiabatic cooling generated from ascending motion over the area south of the TP. In winter, the cooling over the TP is also strengthened, mostly owing to the subsidence-induced weaker adiabatic heating. Due to the importance of the WJ, the potential role of TP thermal effects should be a focus when explaining the East Asian climate change during the LGM. © 2021 American Meteorological Society.
英文关键词	Atmospheric circulation; General circulation models; Ice age; Orographic effects
语种	英语
scopus关键词	Glacial geology; Adiabatic cooling; Adiabatic heating; Atmospheric circulation; General circulation model; Last Glacial Maximum; Meridional temperature gradient; Seasonal variation; Thermal anomalies; Climate change; atmospheric circulation; general circulation model; heating; jet; Last Glacial Maximum; orographic effect; Pleistocene; seasonal variation; westerly; Central Asia; China; Japan; Qinghai-Xizang Plateau
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178592
作者单位	State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an, China; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China; Open Studio for Oceanic-Continental Climate and Environment Changes, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
推荐引用方式 GB/T 7714	Lei J.,Shi Z.,Xie X.,et al. Seasonal variation of the westerly jet over asia in the last glacial maximum: Role of the tibetan plateau heating[J],2021,34(7).
APA	Lei J..,Shi Z..,Xie X..,Sha Y..,Li X..,...&An Z..(2021).Seasonal variation of the westerly jet over asia in the last glacial maximum: Role of the tibetan plateau heating.Journal of Climate,34(7).
MLA	Lei J.,et al."Seasonal variation of the westerly jet over asia in the last glacial maximum: Role of the tibetan plateau heating".Journal of Climate 34.7(2021).